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Investments in Unconsolidated Entities - Summarized Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Combined summarized financial information for unconsolidated entities
Current assets	$ 365	$ 184
Noncurrent assets	2,901	2,303
Current liabilities	231	142
Noncurrent liabilities	184	222
Revenues	769	531	$ 344
Operating income	441	301	181
Net income	$ 424	$ 285	$ 172

The amount of current liabilities reported by an equity method investment of the entity.

The amount of net income (loss) reported by an equity method investment of the entity.

The amount of noncurrent assets reported by an equity method investment of the entity.

The amount of noncurrent liabilities reported by an equity method investment of the entity.